iOS 13.6 (build 17G5059c) is an official Apple over-the-air update for the iPhone 6s+, released on 2020-06-30T17:23:09Z. The update package is 196.95 MB. This is a delta (partial) update that requires 13.6 already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 96af10abd946146b8ad53970774a33967d5dc43d.zip.